The next week I was tired of being bullied and was feeling extra bold because I knew we were leaving soon. Also, I really wanted to fuck my step siste...... I just couldn't get it off my mind. Whenever she tried to get buck with me saying something smart, I said something even smarter back. It completely threw her off guard and she tried to continue her tough role act but I got tough right with her. It eventually began to work and she started laughing a lot. "Yeah.... you just like our daddy. " Dan?" I questioned."Yes, the director... remember." Ohh. Yes... Carry on." Well, he said it wasn't quite right with Mike just kneeling by the couch. He suggested that we should try it with Mike standing by the couch and dropping his trousers... before climbing on top of me." Oh I see... " I said, my heart in my throat with the realization that his cock would be pressed against her mound. My cock gave an involuntary twitch."I see you like!" Sue laughed. "And then he suggested that I should be. Come here, I told her. She stood between my legs, I turned her so she was facing away then told her to put her leg through the twin straps I was holding. First one then other went through the twin straps and I pulled the device into place, cinching first the waist strap then the thigh straps. After checking that it was positioned properly I used the remote and turned it on. Oh wow, she exclaimed as the butterfly vibrator stimulated her clit. I put it through its paces, slow speed to high speed. I smiled as I remembered a boy the day before at school pointing out a girl just like that in her jeans and he called her a gapper. My Mom was a gapper.In my bedroom Mom said, “We can do ourselves or we can do each other if you like.”I managed to say, “What.”Mom laughed and said, “Tell you what. I’ll make you cum, and then you can make me cum. It’ll be all right. I’ll talk you through it. What do say if we both play hooky today and stay home together? I can call in for us both and we can stay.